There is no vaccine for Hepatitis C. If you are an injection drug user, the surest way to prevent the spread of Hepatitis C take serious precaution when injecting drugs. This means avoiding sharing needles, and always using clean ones. Only use syringes from a reliable source, and use a new, disinfected container and a new filter to prepare drugs.
It is also advised to not share any personal items that might have blood on them, such as razors and toothbrushes, and to cover cuts and sores on the skin to keep the virus from spreading through blood or secretions.
If you need access to clean injection drug supplies, visit http://www.nznep.org.nz/
to learn more.